OpenSCAD Tutorial: From Photo to Customizable 3D Model

Published: February 21, 2026

The Best Way to Learn OpenSCAD

Here's the thing about learning OpenSCAD: staring at a blank editor trying to imagine how to describe a 3D shape in code? That's brutal. Most tutorials have you type cube(10); and call it a day. Not exactly inspiring.

This tutorial takes a different approach. Instead of building from nothing, we'll start with an AI-generated OpenSCAD file from a photo—real code for a real shape. You'll learn by modifying something that already works.

What is OpenSCAD?

OpenSCAD is a free, open-source 3D CAD tool. But here's what makes it weird (in a good way): you don't sculpt or click to create shapes. You write code. Describe your model in text, and OpenSCAD renders it.

Why Would You Want That?

  • Precision: Need that hole exactly 4.2mm? Type cylinder(r=2.1). Done.
  • Parametric: Change one variable at the top, regenerate a completely different size
  • Reproducible: Share code, not files. Anyone can regenerate your exact model.
  • Version control: Track changes with Git. See exactly what changed between versions.
  • Automation: Generate 50 size variations with a for loop

Step 1: Generate Your First .scad File

Skip the blank file. Let's generate one from a photo:

  1. Head to 3DMyPhoto
  2. Upload a photo—simple objects work best (logos, signs, keychains, that kind of thing)
  3. Pick the OpenSCAD export option
  4. Download your .scad file

That's it. You've got working code to study. Takes about 2 minutes.

Step 2: Install OpenSCAD

Grab OpenSCAD from openscad.org/downloads. Free, works on Windows/Mac/Linux. Installation takes 2 minutes.

Open your downloaded .scad file. The interface is simple:

  • Left: Code editor—this is where you work
  • Right: 3D preview of your model
  • Bottom: Console (tells you what's wrong when things break)

Step 3: Understanding the Generated Code

Let's break down what you're looking at. AI-generated OpenSCAD typically has these parts:

Variables (The Knobs You Turn)

At the top, you'll see something like:

// Model Parameters
base_width = 50;    // Width in mm
base_height = 10;   // Height in mm
depth = 5;          // Extrusion depth

These are your controls. Change base_width to 100, hit F5, and watch your model double in size. That's parametric modeling in action.

Primitives

OpenSCAD builds models from basic shapes:

  • cube([x, y, z]) — Creates a box
  • cylinder(h, r) — Creates a cylinder
  • sphere(r) — Creates a sphere
  • polygon(points) — Creates 2D shapes
  • linear_extrude(height) — Turns 2D into 3D

Boolean Operations

Combine shapes using CSG (Constructive Solid Geometry):

  • union() — Combine shapes together
  • difference() — Subtract one shape from another
  • intersection() — Keep only where shapes overlap
// Example: A cube with a hole
difference() {
    cube([50, 50, 10]);
    translate([25, 25, -1])
        cylinder(h=12, r=10);
}

Transformations

Move and rotate shapes:

  • translate([x, y, z]) — Move in 3D space
  • rotate([x, y, z]) — Rotate around axes
  • scale([x, y, z]) — Resize proportionally

Step 4: Making Your First Modification

Time to actually change something. Here are three quick exercises:

Exercise 1: Resize It

Find a size variable at the top (probably called something like width or scale). Double the number. Hit F5. See it grow. That's it—you just did parametric modeling.

Exercise 2: Punch a Hole

Need a mounting hole? Wrap your model in difference() and subtract a cylinder: 

difference() {
    // Your original model
    existing_model();
    
    // Mounting hole (3mm radius = 6mm diameter = M6 bolt)
    translate([25, 25, -1])
        cylinder(h=100, r=3, $fn=32);
}

Exercise 3: Add Your Name

3D text is surprisingly easy: 

translate([10, 10, depth])
    linear_extrude(2)
        text("Hello", size=8);

Play with the size parameter until it looks right. Font choice matters too—font="Arial:style=Bold" tends to print cleaner than thin fonts.

Step 5: Export to STL for 3D Printing

Happy with your model? Here's how to get it printed:

  1. Press F6 for a full render (might take 30 seconds to a few minutes depending on complexity)
  2. File → Export → Export as STL
  3. Save your .stl
  4. Open it in your slicer (Cura, PrusaSlicer, OrcaSlicer, whatever you use)
  5. Print it!

Tips for Learning OpenSCAD

  • Study before writing: Generated code teaches you patterns faster than tutorials
  • F5 is your friend: Preview constantly. Every change, hit F5.
  • Read the errors: The console usually tells you exactly which line broke
  • Comment everything: You won't remember why you wrote translate([12.5, 0, -2]) tomorrow
  • Bookmark the cheat sheet: Keep our OpenSCAD cheat sheet in a tab

More Resources

Generate Your First OpenSCAD Model

Learning by doing beats tutorials. Upload a photo, get working code, start experimenting.

Generate Your .scad File

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